7 Signs of Kidney Failure That Your Body Is Crying for Help—But Many Older Adults Don’t Recognize

7 Signs of Kidney Failure That Your Body Is Crying for Help—But Many Older Adults Don’t Recognize

Your kidneys may be small, but they perform some of the most important jobs in your body. Every day, these two bean-shaped organs filter waste products from your blood, remove excess fluid, regulate electrolytes, help control blood pressure, and produce hormones that support healthy red blood cell production and bone health.

One of the greatest challenges with kidney disease is that it often develops slowly and silently. In the early stages of chronic kidney disease (CKD), many people have no symptoms at all. As kidney function declines, however, waste products and excess fluid can build up in the body, leading to noticeable changes.

Older adults are at higher risk of kidney disease because kidney function naturally declines with age, and conditions such as diabetes, high blood pressure, and heart disease become more common. Unfortunately, many symptoms are mistaken for “normal aging.”

It’s important to remember that these symptoms do not necessarily mean kidney failure. Many have other possible causes. However, persistent or worsening symptoms should always be evaluated by a healthcare provider.

Here are seven warning signs that your kidneys may need medical attention.

1. Swelling in the Feet, Ankles, or Legs

One of the earliest and most noticeable signs of declining kidney function is fluid retention, also known as edema.

Healthy kidneys remove excess sodium and water from the body. When they are no longer able to do this efficiently, fluid begins to accumulate in the tissues.

You may notice:

Swollen ankles
Puffy feet
Tight shoes that no longer fit comfortably
Socks leaving deep marks on your skin
Swelling that gradually worsens throughout the day

Swelling can also occur with heart failure, liver disease, or vein disorders, so it is important to determine the underlying cause.

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2. Changes in Urination

Because the kidneys produce urine, changes in urination are often among the first clues that something may be wrong.

Watch for:

Urinating more frequently, especially at night
Passing less urine than usual
Foamy or frothy urine
Blood in the urine
Dark-colored urine
Difficulty urinating

Foamy urine may indicate excess protein leaking into the urine, a common sign of kidney damage.

3. Persistent Fatigue and Weakness

Many people assume fatigue is simply part of getting older.

However, damaged kidneys may produce less erythropoietin, a hormone that stimulates red blood cell production.

This can lead to anemia, causing:

Constant tiredness
Low energy
Weakness
Difficulty concentrating
Reduced physical endurance

Waste products that build up in the bloodstream may also contribute to fatigue.

4. Persistent Itching

Healthy kidneys remove waste products from the blood.

As kidney function declines, these substances may accumulate and contribute to:

Widespread itching
Dry skin
Scratching that interferes with sleep
Itching without an obvious rash

Although allergies and dry skin are much more common causes, persistent unexplained itching should be discussed with your healthcare provider.

5. Shortness of Breath

Kidney disease may cause shortness of breath for several reasons.

These include:

Fluid buildup in the lungs
Anemia
Heart complications related to kidney disease

You may notice:

Difficulty climbing stairs
Becoming winded during routine activities
Breathlessness while lying flat

Sudden or severe shortness of breath requires immediate medical attention.

6. Loss of Appetite, Nausea, or a Metallic Taste

As waste products accumulate in the blood, many people experience digestive symptoms.

These may include:

Poor appetite
Nausea
Vomiting
An unpleasant metallic taste in the mouth
Food tasting different than usual
Unintentional weight loss

These symptoms are more common in advanced kidney disease but can also occur in other medical conditions.

7. Difficulty Concentrating or Mental Confusion

The brain depends on a healthy balance of fluids, electrolytes, and oxygen.

Advanced kidney disease may affect brain function, leading to:

Difficulty concentrating
Memory problems
Mental fog
Trouble staying alert
Confusion

In severe cases, untreated kidney failure can lead to significant changes in mental status and requires urgent medical care.

Who Is Most at Risk?

Several factors increase the risk of chronic kidney disease and kidney failure, including:

Diabetes
High blood pressure
Heart disease
Age over 60
Obesity
Smoking
Family history of kidney disease
Long-term use of certain medications, including frequent use of some nonsteroidal anti-inflammatory drugs (NSAIDs)

If you have one or more of these risk factors, regular kidney function testing is especially important.

How Is Kidney Disease Diagnosed?

Doctors use several simple tests to evaluate kidney health.

Blood Tests

A blood test measures creatinine, which is used to calculate the estimated glomerular filtration rate (eGFR)—a key measure of kidney function.

Urine Tests

Urine testing can detect:

Protein (albumin)
Blood
Signs of kidney damage

A urine albumin-to-creatinine ratio (uACR) is commonly used to identify early kidney disease.

Blood Pressure Measurement

High blood pressure is both a major cause and a complication of chronic kidney disease.

Regular monitoring is essential.

Imaging

Ultrasound or other imaging studies may be recommended to evaluate kidney size, structure, or urinary obstruction.

How Can You Protect Your Kidneys?

Doctors recommend several proven strategies:

Manage Diabetes

Keeping blood sugar within your target range helps reduce kidney damage.

Control Blood Pressure

Healthy blood pressure is one of the most important ways to protect kidney function.

Take prescribed medications consistently.

Eat a Kidney-Friendly Diet

A balanced diet emphasizing:

Fruits
Vegetables
Whole grains
Lean proteins
Lower sodium intake

supports kidney health.

People with advanced kidney disease may require individualized dietary recommendations regarding potassium, phosphorus, and protein.

Stay Physically Active

Aim for at least 150 minutes of moderate-intensity physical activity each week, if appropriate for your health.

Stay Hydrated

Drink enough fluids to remain hydrated unless your healthcare provider has advised you to limit fluids due to kidney or heart disease.

Avoid Smoking

Smoking damages blood vessels and reduces blood flow to the kidneys, increasing the risk of kidney disease progression.

Use Medications Wisely

Avoid taking over-the-counter pain relievers such as NSAIDs more often or at higher doses than recommended unless advised by your healthcare provider, as long-term excessive use may contribute to kidney damage in some individuals.

When Should You See a Doctor?

Schedule an appointment if you experience:

Persistent swelling
Changes in urination
Ongoing fatigue
Blood in the urine
Persistent itching
Loss of appetite
Unexplained nausea
High blood pressure that is difficult to control

Seek emergency medical care immediately if you develop:

Severe shortness of breath
Chest pain
Confusion
Inability to urinate
Sudden swelling accompanied by difficulty breathing

The Bottom Line

Kidney disease often progresses quietly, especially in older adults, making early recognition essential. Swelling in the legs, changes in urination, persistent fatigue, itching, shortness of breath, digestive symptoms, and confusion may all signal declining kidney function.

However, these symptoms are not specific to kidney failure and can occur with many other health conditions. If you notice persistent or worsening symptoms—particularly if you have diabetes, high blood pressure, or are over age 60—don’t assume they’re simply part of aging. Early evaluation with blood and urine tests can identify kidney disease before it progresses to kidney failure, allowing treatment to slow its progression and reduce the risk of serious complications.